Mining-machine



lINTTEn STATES PATENT OEETCE.

CHARLES O. PALMER, OF CLEVELAND, OIIIO.

MINING-MACHINE.

SPECIFICATION forming part of Letters :Patent No. 618,130, dated January24, 1899. Application filed April 27, 1896. Renewed July 8,1898. SerialNo. 685,444. (No model.)

T0 CLZ whom, it' may concern:

Be it known that l, CHARLES O. PALMER, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented certain new and useful Improvements in Mining-Machines, ofwhich the following is a specification,

My invention relates to that class of minin g-machines having ahoriZontally-revolvin g cutter carried on a cutter-arm projecting fromthe side of the machine-frame and adapted when working to travelparallel to the working face.

The objects of my invention are to prevent the upper edge of the bits onthe rear side of the revolving cutter acting on the coal on the upperside of the kerf, and thus bringing it down on the moving cutter andinterfering with its running; also, to increase the clearance on theupper side of the cutter-arm to prevent its being wedged against theroof of the kerf and bent or broken.

lVith this end in view my invention consists in the construction andcombination of parts hereinafter described, and pointed out in theclaims.

In the accompanying drawingsl have only shown so much of the entiremachine as is necessary to disclose the in vention-that is to say, thehoriZontally-revolvingcutter,with its attached cutter-bits, itssupporting-arm, and

means for driving the said cutter. The arrangements for holding thecutter-arm and communicating power from the motor to the rotary cutterfor driving and feeding the same and all the other necessary parts of acomplete machine may be of any of the suitable constructions well knownin the art.

In the drawings, Figure 1 is a plan of a horizontally-revolving cutterof the chain type embodying my invention as seen in the operation ofundercuttin g the coal, the direction of feed being toward the right.Fig. 2 is a vertical section in line A B of Fig. l. Fig. 3 is a plan ofa horizontallyrevolving critter of the wheel type embodying myimprovement as seein in operation, the direction of feed being towardthe right. Fig. 4- is avertical section in line lV X of Fig. 3. Fig. 5is a top view of the cutter-block of my improved cutter-chain. Fig. 6 isan edge view of the cutter-block shown in Fig. 5. Fig. 7 is a verticalsection in line A B of'Fig. l.

The cutter-chain shown in Eig. l has the usual upper and lower linksalternating with a middle link. The cutter-blocks are the links thatcarry the cutter-bits and as here shown are middle links. The links areheld together with pins through their ends in the ordinary manner. Thechain is provided with outside cutter-bits e8, which are held in theoutside cutter-blocks e5 and project from the periphery of the cutter tooperate on the coal when in the front side of its revolution in theordinary manner. In addition to these outside cutter-blocks I add to thechain one or more inside cutter-blocks N5, for reasons hereinafterstated. Each inside cutter-block has passing diagonally through it amortise, in which is secured the cutter-bit N6, whose cutting edgepoints downward, inward, and forward and is adapted to cut the iioor ofthe kerf when on the rear side of its revolution. The bit may be securedby a set-screw N8 or other means known in the art.

To cut aperfectly-at kerf requires that the cutter be kept continuallyin the same plane; but this is practically impossible, because of thedifiiculty of keeping the machine-rails in the same plane, causedprincipally by the inequalities of the iioor which supports the rails.With the ordinary cutter if the cutter-arm rises the bits dig into thetop of the kerf and loosen the coal, to fall down on the revolvingcutter, become jammed in its running parts, and interfere with theirproper working. l overcome this difficulty by lowering the rear side ofthe revolving cutter, so that the cutter-arm may be raised a shortdistance before the outside cutter-bits come in contact with the top ofthe kerf. This lowering of the rear side of the horizontally revolvingcutter or inclining it to the direction of feed makes the outsidecutter-bits when on the rear side drag on the floor of the kerf beingformed, and so scrape an additional amount proportional to the clearancethat is given the bits e8 in Fig. 7 on the upper rear side of therevolving cutters.

Each outside cutter-bitA is setpointing outward at the angle mostadvantageous for peripheral cutting, which is done on the front IDO sideof revolution. So when this cutter-bit is made to act also on the rearside it has the material to be acted on presented on the rear side ofthe cutting edge. The angle which the material makes with the cutter-bitis thus a scraping, not a cutting, angle.

To operate on the rear side to the best advantage requires the cuttingends of the bits to point inward. This obstacle I overcome by adding oneor more extra bits N6, whose cutting end points inward and whose duty itis to cut on the rear side of revolution. This it does in the mostadvantageous manner because set in the position best adapted for cuttingwhen on the rear side of its revolution.

In the other form of horizontally-revolving cutter, which is shown inFigs. 3 and et, the inside cutter-bits N6 project inward from the rim ofthe wheel, in which they are secured-by the set-screw N8. Thecutter-Wheel e6 has its driver e9 and is held by arm e6, while theinside cutter-bit n operates in the same manner as the inside vcutter ofthe chain already described.

Having thus described my invention, what I claim as new isl. In acoal-cutting machine adapted to travel parallel to the workin g face ofthe coal, the combination of a horizontally-revolving cutter inclined toits direction of feed, outside cutter-bits projecting from its peripheryand adapted to cut on the front side in its revolution, mortises in saidcutter extending from the periphery downward and inward, cutters in saidmortises with their cutting edges pointing inwardly and adapted to cutin a single plane on the rear side of its revolntion, together withmeans for driving said cutter and feeding the same to its work.

2. The combination in a coal-cutting machine adapted to travel parallelto the working face of the coal, of a horizontally-revolving cutterinclined to its direction of feed, outside cutter-bits projecting fromits periphery and adapted to cut on the front side in its revolution,mortises in said cutter extending from the periphery downward and in.

ward, chisel-shaped cutter-bits situated in said mortises with theirvertical cutting edges pointing inwardly and adapted to cut in a singleplane on the rear side of its revolution, together with means fordriving said cutter and feeding the same to its work.

3. In a coal-cutter, the combination of a horizontally-revolvingcutter-chain, inclined to its direction of feed; outwardly-projectingcutters adapted to cut on the front side, and one or more cutter-bitshaving an inwardlyprojecting cutting edge, adapted to cut on the underand rear'side of said chain; together with means for driving and guidingthe same.

4. In a coal-cutter, the combination of a horizontally-revolvingcutter-chain inclined to its direction of feed, outwardly-projectingcutters adapted to cut on the'front side in its revolution, one or morecutter-bits having an inwardly-projecting cutting edge adapted to cut ina single plane on the under and rear side of said chain, together withmeans for driving and guiding the same, substantially as described. Y

5. The combination with a coal-cutter chain of a cutteikblock; acutter-bit secured in said block whose cutting edge projects downward,inward and forward, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES O. PALMER. Witnesses:

J. H. VAN DERVEER, N. A. GILBERT.

